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FLEX CONSTRUCTION LIMITED are here to help customers who need an Extension Builder in RM20. We offer a competitive rate to complete all your extens...
The England Team is an established extension buildering business in RM20. We come highly recommended and provide competitive quotes for your work.<...
Grays, RM20
L A CONSTRUCTION LIMITED are here to help customers who need an Extension Builder in RM20. We offer a competitive rate to complete all your extensi...
Trusted and professional extension builder in RM20. Experienced in all extension buildering work and keeping within budget and on quote. PALMERS BU...
From £86,936
Experienced extension builder ready to quote for your work. Renewvate is the best extension builder in RM20. No obligation free quotes and many hap...
From £87,264
Our building services company Vitec Interiors Ltd have over twenty-eight years’ experience in the trade. Since then we have been helping customer...

Building a granny annexe ranges from £86,936 (Renewvate based in RM17) to £87,392 (The England Team based in RM16), but these are just estimates that can help give you an idea of who will be better value in your area.
The best thing to do is to get quotes to build a granny annexe in RM20 by posting a job with HaMuch. We will send it to extension builders in RM20 who will be happy to help you.
Whether you’re looking to extend your kitchen with a side return extension or you want to convert your basement into a liveable space, read our cost guides to get an idea of how much each project costs before getting a more accurate quote from our database of reliable tradespeople.

Underpin a building - £17,715

Two storey extension - £88,322

Build a timber frame extension - £26,215

Build a swimming pool - £81,215

Single storey extension - £59,293

Side return extension - £43,915

Install an RSJ - £2,415

Outbuilding - £10,215

Build a Mansard loft conversion - £52,215

Loft conversion - £35,763

Build a kitchen extension - £42,215

Hip to gable loft conversion - £42,215

Granny annexe - £87,215

Garden office - £10,215

Convert a Garage - £16,215

Garage - £18,715

Build a flat roof extension - £22,215

Build a dormer loft conversion - £42,215

Concrete foundations - £6,465

Convert a bungalow loft - £29,215

Convert a basement - £39,915